Air pump



FIG. 1 is a top, front, right perspective view of an air pump showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom, rear, left perspective view thereof.

The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken lines showing the remainder of the air pump represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for an air pump, as shown and described. 